Nothing has ever travelled 8km/s in the Earth's lower atmosphere; and to be frank I'm not sure whether that's ever going to be possiblecitation needed.
As uhuh points out in the comments on your post, the velocity you need to orbit Earth at ground level is approximately 7910m/s, or a little over Mach 23.
I can however provide you video footage of something traveling at a little under half that, at a more leisurely pace of Mach 10: the Martin Marietta Sprint missile, which was introduced in 1972 as an anti-ballistic missile as part of the Sentinel Program.
By the time it reached its cruising speed in under 5 seconds, it had accelerated to a velocity of Mach 10 (or 3,430m/s), traveling somewhere between FL50 and FL1000.
There is video of it in action here.
The sheer amount of air friction generated required the use of an ablative heatshield which glowed white hot at over 3400°Csource, which you can see in the above video.
To travel 2.3x faster than this, you would need to have 5.3x the amount of kinetic energy; which would likely be highly unsurvivable even with the state of materials science today.